#include "LumenScreenProbeGather.h"
#include "RendererPrivate.h"
#include "ScenePrivate.h"
#include "SceneUtils.h"
#include "PipelineStateCache.h"
#include "ShaderParameterStruct.h"
#include "PixelShaderUtils.h"
#include "ReflectionEnvironment.h"
#include "DistanceFieldAmbientOcclusion.h"

Classes
class	FScreenProbeComputeBRDFProbabilityDensityFunctionCS

class	FScreenProbeComputeLightingProbabilityDensityFunctionCS

class	FScreenProbeGenerateRaysCS

Namespaces
namespace	LumenScreenProbeGather

Functions
FAutoConsoleVariableRef	GVarLumenScreenProbeGatherImportanceSampling (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample"), GLumenScreenProbeImportanceSampling, TEXT("Whether to use Importance Sampling to generate probe trace directions."), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	GVarLumenScreenProbeImportanceSamplingNumLevels (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.NumLevels"), GLumenScreenProbeImportanceSamplingNumLevels, TEXT("Number of refinement levels to use for screen probe importance sampling. Currently only supported by the serial reference path in ScreenProbeGenerateRaysCS."), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	GVarLumenScreenProbeImportanceSampleIncomingLighting (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.IncomingLighting"), GLumenScreenProbeImportanceSampleIncomingLighting, TEXT("Whether to Importance Sample incoming lighting to generate probe trace directions. When disabled, only the BRDF will be importance sampled."), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	GVarLumenScreenProbeImportanceSampleProbeRadianceHistory (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.ProbeRadianceHistory"), GLumenScreenProbeImportanceSampleProbeRadianceHistory, TEXT("Whether to Importance Sample incoming lighting from last frame's filtered traces to generate probe trace directions. When disabled, the Radiance Cache will be used instead."), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	CVarLumenScreenProbeBRDFOctahedronResolution (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.BRDFOctahedronResolution"), GLumenScreenProbeBRDFOctahedronResolution, TEXT("Resolution of the BRDF PDF octahedron per probe."), ECVF_Scalability\|ECVF_RenderThreadSafe)

FAutoConsoleVariableRef	GVarLumenScreenProbeImportanceSamplingMinPDFToTrace (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.MinPDFToTrace"), GLumenScreenProbeImportanceSamplingMinPDFToTrace, TEXT("Minimum normalized BRDF PDF to trace rays for. Larger values cause black corners, but reduce noise as more rays are able to be reassigned to an important direction."), ECVF_Scalability\|ECVF_RenderThreadSafe)

	IMPLEMENT_GLOBAL_SHADER (FScreenProbeComputeBRDFProbabilityDensityFunctionCS, "/Engine/Private/Lumen/LumenScreenProbeImportanceSampling.usf", "ScreenProbeComputeBRDFProbabilityDensityFunctionCS", SF_Compute)

	IMPLEMENT_GLOBAL_SHADER (FScreenProbeComputeLightingProbabilityDensityFunctionCS, "/Engine/Private/Lumen/LumenScreenProbeImportanceSampling.usf", "ScreenProbeComputeLightingProbabilityDensityFunctionCS", SF_Compute)

	IMPLEMENT_GLOBAL_SHADER (FScreenProbeGenerateRaysCS, "/Engine/Private/Lumen/LumenScreenProbeImportanceSampling.usf", "ScreenProbeGenerateRaysCS", SF_Compute)

int32	LumenScreenProbeGather::IsProbeTracingResolutionSupportedForImportanceSampling (int32 TracingResolution)

bool	LumenScreenProbeGather::UseImportanceSampling (const FViewInfo &View)

void	GenerateBRDF_PDF (FRDGBuilder &GraphBuilder, const FViewInfo &View, const FSceneTextures &SceneTextures, FRDGTextureRef &BRDFProbabilityDensityFunction, FRDGBufferSRVRef &BRDFProbabilityDensityFunctionSH, FScreenProbeParameters &ScreenProbeParameters, ERDGPassFlags ComputePassFlags)

void	GenerateImportanceSamplingRays (FRDGBuilder &GraphBuilder, const FViewInfo &View, const FSceneTextures &SceneTextures, const LumenRadianceCache::FRadianceCacheInterpolationParameters &RadianceCacheParameters, FRDGTextureRef BRDFProbabilityDensityFunction, FRDGBufferSRVRef BRDFProbabilityDensityFunctionSH, FScreenProbeParameters &ScreenProbeParameters, ERDGPassFlags ComputePassFlags)

Variables
int32	GLumenScreenProbeImportanceSampling = 1

int32	GLumenScreenProbeImportanceSamplingNumLevels = 1

int32	GLumenScreenProbeImportanceSampleIncomingLighting = 1

int32	GLumenScreenProbeImportanceSampleProbeRadianceHistory = 1

int32	GLumenScreenProbeBRDFOctahedronResolution = 8

float	GLumenScreenProbeImportanceSamplingMinPDFToTrace = .1f

float	GLumenScreenProbeImportanceSamplingHistoryDistanceThreshold = 30

FAutoConsoleVariableRef	CVarLumenScreenProbeImportanceSamplingHistoryDistanceThreshold (TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.HistoryDistanceThreshold"), GLumenScreenProbeImportanceSamplingHistoryDistanceThreshold, TEXT(""), ECVF_RenderThreadSafe)

int32	GLumenScreenProbeGatherReferenceMode

Function Documentation

◆ CVarLumenScreenProbeBRDFOctahedronResolution()

FAutoConsoleVariableRef CVarLumenScreenProbeBRDFOctahedronResolution	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.BRDFOctahedronResolution")	,
		GLumenScreenProbeBRDFOctahedronResolution	,
		TEXT("Resolution of the BRDF PDF octahedron per probe.")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ GenerateBRDF_PDF()

void GenerateBRDF_PDF	(	FRDGBuilder &	GraphBuilder,
		const FViewInfo &	View,
		const FSceneTextures &	SceneTextures,
		FRDGTextureRef &	BRDFProbabilityDensityFunction,
		FRDGBufferSRVRef &	BRDFProbabilityDensityFunctionSH,
		FScreenProbeParameters &	ScreenProbeParameters,
		ERDGPassFlags	ComputePassFlags
	)

◆ GenerateImportanceSamplingRays()

void GenerateImportanceSamplingRays	(	FRDGBuilder &	GraphBuilder,
		const FViewInfo &	View,
		const FSceneTextures &	SceneTextures,
		const LumenRadianceCache::FRadianceCacheInterpolationParameters &	RadianceCacheParameters,
		FRDGTextureRef	BRDFProbabilityDensityFunction,
		FRDGBufferSRVRef	BRDFProbabilityDensityFunctionSH,
		FScreenProbeParameters &	ScreenProbeParameters,
		ERDGPassFlags	ComputePassFlags
	)

◆ GVarLumenScreenProbeGatherImportanceSampling()

FAutoConsoleVariableRef GVarLumenScreenProbeGatherImportanceSampling	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample")	,
		GLumenScreenProbeImportanceSampling	,
		TEXT("Whether to use Importance Sampling to generate probe trace directions.")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ GVarLumenScreenProbeImportanceSampleIncomingLighting()

FAutoConsoleVariableRef GVarLumenScreenProbeImportanceSampleIncomingLighting	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.IncomingLighting")	,
		GLumenScreenProbeImportanceSampleIncomingLighting	,
		TEXT("Whether to Importance Sample incoming lighting to generate probe trace directions. When disabled, only the BRDF will be importance sampled.")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ GVarLumenScreenProbeImportanceSampleProbeRadianceHistory()

FAutoConsoleVariableRef GVarLumenScreenProbeImportanceSampleProbeRadianceHistory	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.ProbeRadianceHistory")	,
		GLumenScreenProbeImportanceSampleProbeRadianceHistory	,
		TEXT("Whether to Importance Sample incoming lighting from last frame's filtered traces to generate probe trace directions. When disabled, the Radiance Cache will be used instead.")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ GVarLumenScreenProbeImportanceSamplingMinPDFToTrace()

FAutoConsoleVariableRef GVarLumenScreenProbeImportanceSamplingMinPDFToTrace	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.MinPDFToTrace")	,
		GLumenScreenProbeImportanceSamplingMinPDFToTrace	,
		TEXT("Minimum normalized BRDF PDF to trace rays for. Larger values cause black corners, but reduce noise as more rays are able to be reassigned to an important direction.")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ GVarLumenScreenProbeImportanceSamplingNumLevels()

FAutoConsoleVariableRef GVarLumenScreenProbeImportanceSamplingNumLevels	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.NumLevels")	,
		GLumenScreenProbeImportanceSamplingNumLevels	,
		TEXT("Number of refinement levels to use for screen probe importance sampling. Currently only supported by the serial reference path in ScreenProbeGenerateRaysCS.")	,
		ECVF_Scalability\|	ECVF_RenderThreadSafe
	)

◆ IMPLEMENT_GLOBAL_SHADER() [1/3]

IMPLEMENT_GLOBAL_SHADER	(	FScreenProbeComputeBRDFProbabilityDensityFunctionCS	,
		"/Engine/Private/Lumen/LumenScreenProbeImportanceSampling.usf"	,
		"ScreenProbeComputeBRDFProbabilityDensityFunctionCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [2/3]

IMPLEMENT_GLOBAL_SHADER	(	FScreenProbeComputeLightingProbabilityDensityFunctionCS	,
		"/Engine/Private/Lumen/LumenScreenProbeImportanceSampling.usf"	,
		"ScreenProbeComputeLightingProbabilityDensityFunctionCS"	,
		SF_Compute
	)

◆ IMPLEMENT_GLOBAL_SHADER() [3/3]

IMPLEMENT_GLOBAL_SHADER	(	FScreenProbeGenerateRaysCS	,
		"/Engine/Private/Lumen/LumenScreenProbeImportanceSampling.usf"	,
		"ScreenProbeGenerateRaysCS"	,
		SF_Compute
	)

Variable Documentation

◆ CVarLumenScreenProbeImportanceSamplingHistoryDistanceThreshold

FAutoConsoleVariableRef CVarLumenScreenProbeImportanceSamplingHistoryDistanceThreshold(TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.HistoryDistanceThreshold"), GLumenScreenProbeImportanceSamplingHistoryDistanceThreshold, TEXT(""), ECVF_RenderThreadSafe)	(	TEXT("r.Lumen.ScreenProbeGather.ImportanceSample.HistoryDistanceThreshold")	,
		GLumenScreenProbeImportanceSamplingHistoryDistanceThreshold	,
		TEXT("")	,
		ECVF_RenderThreadSafe
	)

◆ GLumenScreenProbeBRDFOctahedronResolution

int32 GLumenScreenProbeBRDFOctahedronResolution = 8

◆ GLumenScreenProbeGatherReferenceMode

int32 GLumenScreenProbeGatherReferenceMode

extern

◆ GLumenScreenProbeImportanceSampleIncomingLighting

int32 GLumenScreenProbeImportanceSampleIncomingLighting = 1

◆ GLumenScreenProbeImportanceSampleProbeRadianceHistory

int32 GLumenScreenProbeImportanceSampleProbeRadianceHistory = 1

◆ GLumenScreenProbeImportanceSampling

int32 GLumenScreenProbeImportanceSampling = 1

◆ GLumenScreenProbeImportanceSamplingHistoryDistanceThreshold

float GLumenScreenProbeImportanceSamplingHistoryDistanceThreshold = 30

◆ GLumenScreenProbeImportanceSamplingMinPDFToTrace

float GLumenScreenProbeImportanceSamplingMinPDFToTrace = .1f

◆ GLumenScreenProbeImportanceSamplingNumLevels

int32 GLumenScreenProbeImportanceSamplingNumLevels = 1

Classes

Namespaces

Functions

Variables